#include <stdio.h>

#define PI 3.14159
int main ()
{
	int r = 0;
    int h = 0;
    float v = 0;
	
	scanf("%d %d",&h,&r);
	v = PI*r*r*h;
	 
	
	printf("%d",(int)(20000/v)+1);
	
	return 0; 
}
